Machine for grinding shovel blanks



3 Sheets-Sheet 1.

(No Model.)

. J. E. WOLL. MACHINE FOR GRINDING SHOVEL BLANKS.

Patented May 21 1889,

(No Model.)

3 Sheets-Sheet 2. J. B. WOLL.

MACHINE FOB. GRINDING SHOVEL BLANKS.

Patented May 21 1889.

I Lnl T255125,

(No Model.) 3 .SheetsSheet 3.

J. B. WOLL.

MACHINE FOR GRINDING SHOVEL BLANKS. No. 403,818. Patented May 21 188-9.

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N. PETERS. Phnlo-Lilhagrapher, Wilhinglon. 0.1:.

UNIT D STATES PATENT O FICE.

JOSEPH E. \VOLL, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TOHENRY J. THOMA AND WVILLIAM M. MOOOMBS, OF' SAME PLACE;

MACHINE FOR GRINDING SHOVEL-BLANKS.

SPECIFICATION forming part of Letters Patent No. 403,818, dated May 21,1889. Application filed March 17, 1887. Renewed March 7, 1889. SerialNo. 302,389. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH E. WoLL, of Pittsburg, in theecounty ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Machines for Grinding Shovel-Blanks; and I do herebydeclare the following to be a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, forming partof this specification, in which Figurel is a plan view of the machine.Fig. 2 is a side view thereof. Fig. 3 is avertical cross-section on theline a: w of Fig. 2. Fig. 4 is a side elevation of the rising table.Fig. 5 is a plan view of the plate 19. Fig. 6 is a side view of thetable and table-top separated from each other. Fig. 7 is a partial planview thereof. Fig. 8 is a vertical crosssection on the line y y of Fig.7.

Like symbols of reference indicate like parts in each.

In the drawings, (see Figs. 1 and 2,) 2 represents the fixed part orframe of the machine. Mounted on theframe 2 in suitable slide-bearingsare two slide-bars, 3, which are set at an angle to each other, as shownin Fig. 1. At the rear end of the slide-bars 3 they are provided withcam yokes or heads 4,in which are fitted eccentrics 5. These eccentricsare fixed to and are driven by rotary shafts 6. The shafts 6 are drivenby belts 7, extending from an overhead shaft, 8, around belt-pulleys 9.At the forward ends of the slide-bars 3 are transversely journaledrotary shafts 10, which carry emery-wheels 11 at their inner ends. Theshafts 10 are driven by belts 12, which extend from the overhead shaft 8around belt-pulleys 13 on the shafts 10. The rotation of the shaft 8drives the eccentrics 5 and causes the slide-bars 3 to reciprocate backand forth on their slidebearings. The emerywheels at the ends of theshafts 3 are arranged so that they shall reciprocate with the slidebarsover the surface of a table, 14, on which the shovel-blanks are placed.In Fig. 1 I show the shovel-blank set on top of the table.

1) indicates the scarf to be ground. The reciprocation of the bars 3carries the emerywheels back and forth over the scarf and grinds it downflush with the blank. The cams 5 are set relatively to each other, sothat they shall move the slide-bars 3 simultaneously in oppositedirections, one bar moving forward while the other moves back. Theconstruction of the table which supports the shovel-blank is shown inFig. 2 and in the figures on the third sheet of the drawings. Itconsists of a vertical hollow box, 14, within which is mounted avertical slide-bar, 15. At the base of the box 14 is a foot-lever, 16,which is pivoted at 17 and connected with the slide 15 by a link, 18. Atthe top of the slide 15 is a fiat head-plate, 19, supported above theslide by suitable bracket-arms, 20. The table-top 21 is a fiat metalplate having a central pin, 22, on its under side, which fits into ahole, 23, in the top of the plate 19. The top 21 may be turned on thepin 22 as on a pivot. The limits of its rotation are confined bystop-pins 24 on the under side of the table-top, which are arranged toengage the corners of the plate 19. (See Fig. 5.)

On top of the rotary top 21 and at the end thereof is a socket-piece,25, having a horizontal recess, 26, to confine theshovel-strap. Theshovel-blank is put on the tabletop, the strap being set between twopins, 27, and inserted into the bore 25. The foot-lever 16 is thendepressed so as to raise the table-topup to the level of thereciprocating emery-wheels. The cam-shafts 6 are then set in motion, soas to reciprocate the emery-Wheels over the edges of the scarfs, and, ifnecessary, the table-top is turned on the pivot 22 during thereciprocation of the emery-wheels, so as to present the entire curvedlines of the scarfs to the grinding action.

Other mechanism may be used to reciprocate the slide-bars 3 instead ofthe cams. For example, hand-levers may be employed, since it isnecessary to impart only a slow motion to these parts.

I claim 1. In a machine for grinding the scarfs of shovels, thecombination, with a table for supporting the blank, of two rotarygrindingwheels having reciprocating bearings arranged to converge overthe table, and mechanism for imparting alternate reciprocatory motion tosaid bearings, substantially as and for the purposes specified.

2. In a machine for grinding the scarfs of reciprocating grinder, of asliding gravity or drop table having an oscillatory shovel-bed, and apivoted lever, by means of which the sliding table can be raised,substantially as and for the purposes specified.

In testimonywhereof I have hereunto set my hand this 22d day ofFebruary, A. D.1887.

JOSEPH E. WOLL.

Witnessesf W. B. OoRWm, THOMAS W. BAKEWELL.

